India’s largest temperature sensor maker opens its Rs 650 crore mainboard issue on August 20 — a rare backward-integrated moat business with no listed peer
India’s largest contact and non-contact temperature sensor manufacturer plans to raise Rs 650 crore via a mainboard listing on BSE and NSE.
Tempsens Instruments (India) Ltd. (TIIL) sits at a highly specialised corner of Indian industrial equipment — thermal engineering. Every large industrial process, from steel-making to nuclear power to glass manufacturing to oil refining, needs to measure and control temperature accurately. That is the market TIIL serves, and it has quietly built one of the strongest positions in the country.
According to the F&S Report, TIIL is the largest manufacturer of contact and non-contact temperature sensors in India, with approximately 10.5% market share in the temperature sensor segment in FY26. It is the only Indian manufacturer of non-contact temperature sensors, with about 21.3% market share in that sub-segment. By indigenising non-contact sensor development, TIIL has effectively reduced India’s reliance on foreign suppliers in this specialised area.
The moat runs deeper. TIIL is the only manufacturer of fibre optic temperature sensors and thermal profiling systems in India, and the only manufacturer of pyrometers and online thermal imagers in India in FY26. It is also one of the largest manufacturers of electrical heaters in India by installed capacity, and one of the few players with the capability to manufacture low-voltage process heaters (with ongoing R&D on medium-voltage heaters).
The product portfolio is structured around three verticals — temperature sensing solutions, electrical heating solutions, and specialised cables. These products play a critical role in the safe, efficient and reliable operation of manufacturing across power, steel, glass, oil and gas, chemicals, pharmaceuticals and nuclear applications.
The revenue model is a two-pronged one. On the Project/OEM side, TIIL supplies instrumentation for greenfield and brownfield industrial setups — high-barrier, approval-driven work with stringent qualification requirements. Winning these projects establishes technical credibility and customer trust.
On the Maintenance, Repair and Operations (MRO) replacement side, the company serves recurring demand from existing customers. MRO orders provide stable, recurring revenue that is less dependent on capital expenditure cycles, and often flow from the Project/OEM base — creating a cascading benefit.
Customer diversification is meaningful. From April 1, 2023 to March 31, 2026, TIIL has served over 1,000 unique customers. Top 10 customer concentration has been consistently under 25% of revenue and trending downward — reducing dependency on any single customer.
TIIL, its subsidiaries and JVs have been granted 12 patents in India, 8 registered trademarks in India, 1 copyright, and 39 trademark registrations across various international jurisdictions. Additional applications are pending.
Backward integration is a key differentiator. TIIL is among the very few companies in the world with a backward-integrated manufacturing facility for thermocouples, cables and electrical heaters, located at Udaipur. It is also one of the very few Indian manufacturers to hold the ASME U-Stamp certification for pressure vessels. Key in-house capabilities include alloy melting, hot-rolling, annealing, mineral-insulated cable manufacturing, machining, final assembly and calibration.
The R&D pipeline includes slot resistance temperature detectors, mid-voltage heaters, pressurizer heaters for nuclear reactors, and a new generation of high-performance infrared pyrometers and online thermal imagers.
Exports contribute nearly 30% of revenue — a significant international presence that leverages the same backward-integrated Udaipur base.
As of March 31, 2026, TIIL had 814 employees on its payroll and 1,189 contractual workers — a substantial operational team consistent with running a backward-integrated manufacturing facility of this scale.
Issue Details
| Particulars | Details |
|---|---|
| Issue Opens | August 20, 2026 |
| Issue Closes | August 24, 2026 |
| Listing | BSE, NSE (Mainboard) |
| Price Band | Rs 285 – Rs 300 per share |
| Face Value | Rs 4 |
| Issue Size | Rs 650.00 crore |
| Fresh Issue | Rs 95.00 crore (approx. 31.67 lakh shares) |
| OFS | Rs 555.00 crore (1,85,00,000 shares) |
| Lot Size | 50 shares (multiples thereafter) |
| Min. Retail Investment | Rs 15,000 |
| Post-IPO Market Cap | Rs 2,514.98 crore |
| IPO Constitutes | 25.85% of post-IPO equity |
| BRLMs | ICICI Securities, JM Financial |
| Registrar | KFin Technologies Ltd. |
From the fresh proceeds, Rs 55 crore is earmarked for repayment or prepayment of borrowings, Rs 18.13 crore for capex on electrical heating solutions and specialised cable solutions, and the balance for general corporate purposes.
The company has reserved shares worth Rs 1.50 crore (approx. 50,000 shares) for eligible employees. Post-IPO, paid-up equity moves from Rs 32.27 crore to Rs 33.53 crore. Note that the OFS at Rs 555 crore is significantly larger than the fresh issue of Rs 95 crore — meaning most of the money goes to existing shareholders rather than into the business.
The promoter and selling stakeholder average cost of acquisition ranges widely from Rs Negligible and Rs NIL up to Rs 55.63 per share. This reflects earlier equity issues and four bonus issues over the years — 1-for-1 in October 2004, 1-for-1 in March 2007, 1-for-2 in March 2011, and 10-for-1 in March 2025.
GMP Watch
Grey market interest has been moderate. Tempsens Instruments IPO GMP is around Rs 30-40 in the days leading up to the issue opening, suggesting an estimated listing price of around Rs 330-340 — a premium of roughly 10-13% over the upper price band of Rs 300.
This is a reasonable grey market signal for a mainboard IPO with a moat business and no listed peer, though not spectacular. The GMP could move meaningfully around anchor bidding and Day 2/3 subscription trends. As always, GMP is unofficial, unregulated by SEBI and quick to change — treat it as one sentiment indicator, not a listing forecast.
Financial Performance
| Particulars (Rs cr) | FY24 | FY25 | FY26 |
|---|---|---|---|
| Total Income | 278.04 | 382.47 | 455.86 |
| PAT | 40.92 | 62.56 | 71.07 |
| PAT Margin | 14.72% | 16.36% | 15.59% |
| RoCE | 22.82% | 23.08% | 21.61% |
Revenue has grown from Rs 278.04 crore in FY24 to Rs 455.86 crore in FY26 — a healthy 64% jump in two years, driven by higher Project/OEM orders, expanding MRO base and growing export contribution.
PAT has climbed from Rs 40.92 crore to Rs 71.07 crore in the same period. PAT margin has moved in a tight band around 15-16%, and RoCE has held steady around 22-23% — genuinely respectable numbers for a specialised industrial equipment manufacturer.
The consistency of margins and RoCE across three years is what stands out. This is not a company where FY26 numbers look inflated versus prior years. The trajectory reflects genuine operating discipline and pricing power that comes with market leadership and technical differentiation.
Average EPS over three years is Rs 8.02 and average RoNW is 15.25%. At the upper band of Rs 300, the P/E works out to 35.38x on FY26 earnings and 40.21x on FY25 — a rich multiple that reflects the moat, market leadership and lack of listed peer. The issue is priced at a P/BV of 4.87 on pre-IPO NAV and 4.25 on post-IPO NAV of Rs 70.67 per share.
The company has no listed peers to compare with per the offer document, which is both a positive (scarcity value, differentiation) and a negative (harder to benchmark valuation).
According to a note by Ajcon Global, “Tempsens is India’s leading temperature-sensor manufacturer with rare backward integration, patented technology, and ASME certification creating high entry barriers. No listed Indian peer exists, offering pure-play exposure. Diversified customer base, recurring MRO revenue, and clear growth levers support a resilient, moat-protected business model with sustainable long-term earnings visibility.”
On valuation, Ajcon adds: “At the upper price band of Rs 300, the issue is valued at a P/E multiple of about 35.42x on its FY26 post-IPO EPS of Rs 8.47.” The brokerage gives a ‘SUBSCRIBE’ rating for three reasons: “(1) India’s largest temperature sensor manufacturer and sole non-contact sensor player, with strong indigenization-led entry barriers; (2) Resilient revenue mix — high-barrier Project/OEM orders plus recurring MRO revenue, with low customer concentration; (3) Strong technical moat — backward-integrated manufacturing, 12 patents, and ASME U-Stamp certification.”
Risks to Consider
The valuation is fully priced. At 35.38x FY26 earnings, the P/E is not cheap, and any margin compression or slowdown in Project/OEM order flow could hurt the stock.
Concentration in the OFS component is the most immediate structural concern. Rs 555 crore of the Rs 650 crore issue goes to selling shareholders rather than into the business — meaning this is largely a promoter and existing shareholder exit event.
The industrial cycle matters. Project/OEM orders depend on capex cycles in power, steel, oil and gas, and other end industries. Any slowdown in Indian industrial capex or export markets could hit near-term revenue.
Input cost volatility is real. Specialised alloys, copper, mineral-insulated cable materials and other raw materials are subject to global price swings. Any input cost pressure that isn’t passed through can compress margins.
Export exposure at ~30% brings currency risk and geopolitical exposure. Any prolonged slowdown in industrial capex in key export markets could hit revenue.